Transmitter and transmitting method, receiver and receiving method, pulse detection method, and tracking method

Abstract

Method and apparatus for sending and receiving pulses in the ultra wide band communication system while avoiding spectrum problems. Carrier waves, for example, are generated with a frequency set in the center of the transmission band of 7.5 GHz to avoid the 5 GHz currently used by wireless LAN systems and frequencies below 3 GHz specified for spectrum mask by the FCC. Baseband pulses are then generated at time intervals equal to a fraction 1/n of this frequency (n is an integer). The baseband pulses are rectangular waves with a length that is an integer multiple of one period of the carrier wave on the specified frequency. Finally 3-cycle pulses are made by frequency-modulating the baseband pulses with the carrier waves.

1. A transmitter comprising:
 a carrier wave generation means for generating a carrier wave possessing a predetermined frequency; 
 a baseband pulse generation means for generating baseband pulses at time intervals equal to a fraction 1/n of said predetermined frequency (n is an integer); and 
 a modulation means for modulating said baseband pulses with said carrier wave and generating an n cycle pulse, 
 wherein said carrier wave generation means generates a carrier wave possessing a frequency set in a center of the transmission band. 
 
   
   
     2. A transmitter comprising:
 a baseband pulse generation means for generating baseband pulses with a pulse width equal to a rectangular wave pulse length that is an integer multiple of one cycle of a predetermined frequency carrier wave possessing a frequency set in a center of a band not interfering with communication systems already in use; and 
 a modulation means for modulating said baseband pulses with said carrier wave and generating an n cycle pulse with a number of cycles n equal to the integer multiple. 
 
   
   
     3. A transmitter comprising:
 a baseband pulse generation means for generating baseband pulses with a pulse width equal to a rectangular wave pulse length that is an integer multiple of one cycle of a predetermined frequency carrier wave; and 
 a modulation means for modulating said baseband pulses with said carrier wave and generating an n cycle pulse with a number of cycles n equal to the integer multiple, 
 wherein said carrier wave has a frequency set in a center of the transmission band. 
 
   
   
     4. A transmitter comprising:
 a carrier wave generation means for generating a carrier wave possessing a predetermined frequency; 
 a baseband pulse generation means for generating baseband pulses at time intervals equal to a fraction 1/n of said predetermined frequency (n is an integer); and 
 a modulation means for modulating said baseband pulses with said carrier wave and generating an n cycle pulse, 
 wherein said carrier wave generation means generates a carrier wave possessing a frequency set in a center of a band not interfering with communication systems already in use. 
 
   
   
     5. A transmitter according to  claim 1 , wherein said modulation means converts the frequency of said baseband pulses by using said carrier wave. 
   
   
     6. A transmission method comprising:
 generating a carrier wave possessing a predetermined frequency set in a center of the transmission band; 
 generating baseband pulses at time intervals equal to a fraction 1/n of said frequency (n is an integer); 
 modulating said baseband pulses by using said carrier wave; and 
 generating and transmitting an n cycle pulse. 
 
   
   
     7. A transmitter comprising:
 a carrier wave generation means for generating a carrier wave possessing a predetermined frequency; 
 a baseband pulse generation means for generating baseband pulses at time intervals equal to a fraction 1/n of said predetermined frequency (n is an integer); 
 a modulation means for modulating said baseband pulses with said carrier wave and generating an n cycle pulse; and 
 a spread code generator module for generating spread codes for direct spectrum spread. 
 
   
   
     8. A transmitter comprising:
 a carrier wave generator configured to generate a carrier wave possessing a predetermined frequency set in a center of the transmission band; 
 a baseband pulse generator configured to generate baseband pulses at time intervals equal to a fraction 1/n of said predetermined frequency (n is an integer); and 
 a modulator configured to modulate said baseband pulses with said carrier wave and to create an n cycle pulse. 
 
   
   
     9. A transmitter comprising:
 a baseband pulse generator configured to generate baseband pulses with a pulse width equal to a rectangular wave pulse length that is an integer multiple of one cycle of a predetermined frequency carrier wave set in a center of the transmission band; and 
 a modulator configured to modulate said baseband pulses with said carrier wave and to create an n cycle pulse with a number of cycles n equal to the integer multiple. 
 
   
   
     10. A transmission method comprising:
 generating a carrier wave possessing a predetermined frequency set in a center of a band not interfering with communication systems already in use; 
 generating baseband pulses at time intervals equal to a fraction 1/n of said frequency (n is an integer); 
 modulating said baseband pulses by using said carrier wave; and 
 generating and transmitting an n cycle pulse. 
 
   
   
     11. A transmitter comprising:
 a carrier wave generator configured to generate a carrier wave possessing a predetermined frequency set in a center of a band not interfering with communication systems already in use; 
 a baseband pulse generator configured to generate baseband pulses at time intervals equal to a fraction 1/n of said predetermined frequency (n is an integer); and 
 a modulator configured to modulate said baseband pulses with said carrier wave and to create an n cycle pulse. 
 
   
   
     12. A transmitter comprising:
 a baseband pulse generator configured to generate baseband pulses with a pulse width equal to a rectangular wave pulse length that is an integer multiple of one cycle of a predetermined frequency carrier wave, said predetermined frequency carrier wave possessing a frequency set in a center of a band not interfering with communication systems already in use; and 
 a modulator configured to modulate said baseband pulses with said carrier wave and to create an n cycle pulse with a number of cycles n equal to the integer multiple.